I never said it was free floating formaldahyde, it just seems totally against every instinct I have to put a water soluble cleaning agent in my tank.
I'm not doubting people have used them successfully, I'm just in utter disbelief I guess because, like I said, goes against every instinct in my body.
To use your own sodium chloride analogy...
You say sodium is dangerous, and chloride is dangerous, and sodium chloride is safe so we use it in our tank. But you also leave out that sodium chloride is commonly occurring in natural sea water. Remind me where can I find Formaldehyde-Melamine-Sodium bisulfite copolymer in abundance in the ocean, again?
Again, not trying to start an argument and if nobody has had any issues with them, cool cool, just like I said, makes the hairs stand up on end on my arms just thinking about it